kerrplease,
Though you may be oblivious to it there's some advice in this thread you should follow. I'll keep it simple for a new brewer.
1. Keep the beer warm when fermenting, about 18-20°C is ideal If it gets too cool it will slow down the ferment and you will need to leave it longer.
2. Allow at
least 1 week, preferably 2 weeks, for the beer to fully ferment BEFORE bottling.
3. If you bottle too early the beer will continue to ferment in the bottle, and will cause bad flavours and potentially explode the bottles.
4. Your FG for a kit brew should be around the 1.010 mark. It will change slightly depending on the sugar you used. 1.021 is too high and needed longer to ferment fully.
There are lots of videos, ways to brew, things to add, temps, yeast types etc. that will change a lot of things but for a simple kit brew like yours follow the above points. As it stands the the beer you've bottled will likely be a fizzy mess or may lead to exploding bottles. We've almost all been there.
Open one up tonight, no harm in learning how a 'young' beer tastes. Please video it too
h34r: